Mathematical Re...

Which of the following statements is the contrapositive of "If a polygon has four sides, then it is called a quadrilateral."?

Which of the following statements is the contrapositive of "If you understand logic, you will be a good consumer."?

I had Rs. 200 with me. I gave Rs. x to Anwar, Rs. $$\displaystyle \frac{x}{2}$$ to Vidhu and I am left with Rs $$\displaystyle \frac{x}{2}$$. The amount I gave to vidhu is ..........

"If Tom buys a red skateboard then Amanda buys green in-line skates".  Which statement below is logically equivalent?

The statement "If x is divisible by 8 then it is divisible by 6" is false if x equals 

Which of the following is the negation of the statement, For all odd primes $$p < q$$ there exists positive non-primes $$r < s$$ such that $$p^2 + q^2 = r^2 + s^2$$. 

Negation of "Ram is in class $$X$$ or Rashmi is in class $$XII$$" is

Consider the statement, if $$n$$ is divisible by $$30$$ then $$n$$ is divisible by $$2, 3$$ and by $$5$$. Which of the following statements is equivalent to this statement?

Let p : A triangle is equilateral, q : A triangle is equiangular then inverse of $$\displaystyle q\rightarrow p$$ is

The statement form $$(p \Leftrightarrow  r) \Rightarrow (q \Leftrightarrow  r)$$ is equivalent to